| 摘要 |
Providing an ultra-compact zoom lens system having a vibration reduction function, suitable for a compact optical device using a solid-state imaging device. The system includes, in order from an object, a first lens group having positive power and a bending member for bending the optical path by about 90°, a second lens group having negative power, a third lens group having positive power, and a fourth lens group having positive power. Upon zooming from a wide-angle end state to a telephoto end state, the first and third lens groups are fixed with respect to an image plane, the second lens group is moved to the image, and the fourth lens group is moved at first to the object and then to the image plane. An image blur on the image plane caused by a camera shake is corrected by moving the third lens group perpendicularly to the optical axis.
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